1996 Pontiac Grand Am Owner's Manual - Page 245

NOTICE: When adding coolant it is important thatyou use DEX-COOL (orange-colored, silicate-free) coolant meeting GM Specification 6277M. If silicated coolant is added to the system, premature engine, heater coreor radiator corrosion may result. In addition, theengine coolant will require change sooner --,at 30,000 miles (50 000 km)'or 24 months whichever occurs first. TM What to Use . Use a mixture of one-half clean water (preferably distilled) and one-half DEX-COOL (orange-colored, silicate-free) antifreeze that meets GM Specification 6277M, which won't damage aluminum parts. Use GM Engine Coolant Supplement (sealer) (GM Part No. 3634621) with any complete coolant change. If you use this mixture, you don't need to add anything else. TM Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol,can bo'il beforethe proper coolant mix will. Your vehicle'scoolant warning' system is set for the proper coolant mix. With plain water or thewrong mix, your engine could get too hot but you wouldn't get the overheat warning. Your engine could catch fire and you or others could be burned.Use a 5060 mix of clean waterand DEX-COOL (orange-colored, silicate-free) antifreeze. f' . ..